50 NORTH AMERICAN 



cavated, extending with nearly equal width to within very short distances 

 of the base and apex, bottom impunetate. Elytra at base very slightly 

 narrower than the head ; sides very strongly divergent posteriorly, very 

 slightly longer than the width at base, rather strongly and evenly arcuate ; 

 together very broadly, evenly, and strongly emarginate behind ; suture 

 slightly shorter than the pronotum ; surface depressed, even; very deeply, 

 rather finely, very closely and unevenly punctate and channeled, interspaces 

 very narrow, convex, and shining. First two abdominal segments equal in 

 width, slightly wider than the contiguous elytra ; surface broadly and rather 

 feebly convex ; coarsely, closely, and rather feebly punctulate ; transverse 

 carinae tricuspid, middle cusps very strong, finely acuminate at tip, lateral 

 large, diffused, and exceedingly indefinite. Legs moderate, piceous-black 

 above, dark rufo-piceous beneath ; first joint of posterior tarsi one-half as 

 long again as the second. 



Male. — Unknown. 



Female. — Sixth ventral segment angularly produced at apex, vertex very 

 feebly rounded. 



Length 3.6 mm. 



Thurston County, Washington Territory, 1. 



The robust prothorax and short elytra will readily distinguish this 

 very well-marked species. The maxillary palpi are lacking in the 

 type specimen. 



31. S. insillaris n. sp. — Form slender. Pubescence rather long, fine, 

 and somewhat sparse, recumbent, rather pale fusco-cinereous. Head large, 

 more than twice as wide as long ; interocular surface nearly twice as wide as 

 the eye, rather strongly depressed ; longitudinal elevation narrower than 

 the lateral portions, evenly and very strongly convex, very prominent ; 

 punctures fine, close, and even at the sides, very minute and sparse in the 

 middle ; ocular lines meeting at one length in advance ; antennae slightly 

 longer than the width of head, slender, piceous-brown, growing slightly 

 paler toward tip, club rather small ; third joint one-fourth as long again as 

 the fourth, fourth slightly longer than the fifth, seventh slightly shorter and 

 more robust than the sixth, eighth oval, joints of club increasing very gradu- 

 ally in length and thickness ; maxillary palpi long, first joint pale testa- 

 ceous, second darker, rufo-testaceous, third very long, dark piceous-brown. 

 Prothorax widest distinctly before the middle, where it is three-fourths as 

 wide as the head and just perceptibly narrower than long ; sides thence very 

 slightly convergent posteriorly and rather strongly sinuate ; anterior margin 

 slightly shorter and much more arcuate than the posterior ; surface rather 

 strongly tuberculate at the sides near the base, finely and irregularly 

 punctate; punctures very feeble, isolated in the middle, crowded toward the 

 margins, interspaces flat and highly polished ; canaliculation short, oval, 

 deeply impressed, beginning slightly before the middle, scarcely more than 

 one-fourth as long as the pronotum. Elytra at base slightly narrower than 

 the head ; sides moderately or somewhat strongly divergent posteriorly, very 

 slightly longer than the width at base, feebly arcuate ; together just percep- 



